Introductory it as Subject

6.1 it V adj that

The verb is followed by an adjective group and a that-clause. The adjective group is the Complement.

it

Verb group

adjective group

that-clause

Subject

Verb

Complement

Clause

It

is

important

that you say exactly what you mean.

It

seems

certain

that elections will go ahead.

These verbs are concerned with what a situation is, seems, or becomes. All the verbs in this group are link verbs(see Chapter 5). The word that is often omitted, as in the clause It is certain he will be there.

I think it's important that you get to know them beforehand.

It quickly becomes apparent that he is not mad at all.

It looks increasingly likely that the three national parties may form a government of national unity.

Though the course of events which led to the cataclysm is well known, it remains astonishing that a whole society was overthrown so easily.